PEAK Material Clip - Great for your tying vise - Fly Tying PEAK's Material Clip is provided with 2 sizes of spring to grip a wider range of materials better. PEAK's straight spring design works better than a conventional wrapped spring, which results in the spring coils forming an inverted "V". PEAK's straight spring leaves parallel coils which will hold your materials more securely. The PEAK Material Clip will fit any 1/4" Diameter shaft. Clips will rotate to any angle needed or completely out of the way and multiple Material Clips can be used in tandem.